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Income Taxes - GILTI and Valuation allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes
Amount of tax benefit from GILTI high-tax exclusion election	$ 5
Net impact of global intangible low-taxed income ("GILTI") (as a percent)	(1.00%)	1.20%	1.00%
Increase in valuation allowance of foreign subsidiary net deferred tax assets	$ 3	$ 2	$ 6
Percentage increase in valuation allowance of foreign subsidiary net deferred tax assets	0.6	0.3	1.0

X

- Definition

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to global intangible low-taxed income ("GILTI").

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No definition available.

+ Details

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X

- Definition

Amount of tax benefit as a result of global intangible low-taxed income (GILTI) high-tax exclusion election.

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No definition available.

+ Details

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X

- Definition

The amount of increase in the valuation allowance on the net deferred tax assets of a foreign subsidiary.

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No definition available.

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X

- Definition

The percentage increase in the valuation allowance on the net deferred tax assets of a foreign subsidiary.

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No definition available.

+ Details

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X

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No definition available.

+ Details

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